/* ========================================
   SAT Prep — Base Styles
   Premium education app theme
   ======================================== */

/* CSS Variables — Design Tokens */
:root {
  /* Colors */
  --color-primary: #2D3A8C;
  --color-primary-light: #3D4DAE;
  --color-primary-dark: #1E2860;
  --color-accent: #6C5CE7;
  --color-accent-light: #8B7FF0;
  --color-accent-dark: #5A4BD6;
  --color-white: #FFFFFF;
  --color-success: #00B894;
  --color-success-light: #B2F2E4;
  --color-warning: #FDCB6E;
  --color-warning-light: #FEE9B2;
  --color-error: #E17055;
  --color-error-light: #FACFC6;
  --color-info: #74B9FF;

  /* Backgrounds */
  --bg-primary: #F0F2F8;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-input: #E8EAF2;
  --bg-nav: #FFFFFF;
  --bg-header: #2D3A8C;

  /* Text */
  --text-primary: #1A1D3B;
  --text-secondary: #4A5078;
  --text-muted: #6B7194;
  --text-on-primary: #FFFFFF;
  --text-on-accent: #FFFFFF;

  /* Borders */
  --border-color: #D4D8E8;
  --border-color-light: #E8EAF2;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(45, 58, 140, 0.06);
  --shadow-md: 0 4px 12px rgba(45, 58, 140, 0.1);
  --shadow-lg: 0 10px 24px rgba(45, 58, 140, 0.12);
  --shadow-card: 0 2px 8px rgba(45, 58, 140, 0.07);
  --shadow-glow: 0 0 20px rgba(108, 92, 231, 0.15);

  /* Spacing (8px grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-serif: Georgia, 'Times New Roman', Times, serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --header-height: 56px;
  --nav-height: 64px;
  --max-width: 640px;
  --timer-height: 48px;
}

/* ========================================
   Dark Mode
   ======================================== */
[data-theme="dark"] {
  --bg-primary: #0D0F1A;
  --bg-secondary: #171A2E;
  --bg-card: #1C2040;
  --bg-input: #252A4A;
  --bg-nav: #171A2E;
  --bg-header: #0D0F1A;

  --text-primary: #E8EAF2;
  --text-secondary: #9BA0C0;
  --text-muted: #6B7194;

  --border-color: #2A2F50;
  --border-color-light: #1E2240;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(108, 92, 231, 0.25);
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(45, 58, 140, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(116, 185, 255, 0.02) 0%, transparent 50%);
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

/* Focus indicators for accessibility */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================
   Layout
   ======================================== */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, var(--bg-header) 0%, var(--color-primary-light) 100%);
  color: var(--text-on-primary);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  box-shadow: var(--shadow-md);
}

.app-header h1 {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.app-header h1 .header-icon {
  font-size: var(--text-xl);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-btn {
  background: none;
  border: none;
  color: var(--text-on-primary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  font-size: var(--text-xl);
  transition: background var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.header-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Main Content */
#main-content {
  flex: 1;
  padding: var(--space-4);
  padding-bottom: calc(var(--nav-height) + env(safe-area-inset-bottom, 0px) + var(--space-4));
}

/* Page transitions */
.page-exit {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.page-enter {
  animation: pageEnterSmooth 280ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes pageEnterSmooth {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Bottom Navigation
   ======================================== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-nav);
  height: calc(var(--nav-height) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  display: flex;
  align-items: center;
  justify-content: space-around;
  box-shadow: 0 -1px 8px rgba(45, 58, 140, 0.08);
  border-top: 1px solid var(--border-color);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: var(--space-1) var(--space-2);
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: 500;
  transition: color var(--transition-fast);
  min-width: 56px;
  -webkit-tap-highlight-color: transparent;
  position: relative;
}

.nav-item .nav-icon {
  font-size: 20px;
  line-height: 1;
}

.nav-item.active {
  color: var(--color-accent);
  font-weight: 600;
}

.nav-item.active::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 0 0 2px 2px;
}

[data-theme="dark"] .nav-item.active {
  color: var(--color-accent-light);
}

[data-theme="dark"] .nav-item.active::before {
  background: var(--color-accent-light);
}

.nav-item:hover {
  color: var(--color-primary);
}

/* ========================================
   Common Components
   ======================================== */

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-color-light);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card + .card {
  margin-top: var(--space-3);
}

.card:hover,
.card-hover:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-hover {
  cursor: pointer;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card-hover:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
  transition: all 80ms ease;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 48px;
  min-width: 48px;
  text-decoration: none;
  line-height: 1.2;
}

.btn:active {
  transform: scale(0.95);
  transition: transform 80ms ease;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--text-on-primary);
}

.btn-primary:hover {
  background: var(--color-primary-light);
}

.btn-primary:active {
  background: var(--color-primary-dark);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--text-on-accent);
}

.btn-accent:hover {
  background: var(--color-accent-light);
}

.btn-accent:active {
  background: var(--color-accent-dark);
}

.btn-success {
  background: var(--color-success);
  color: white;
}

.btn-error {
  background: var(--color-error);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-input);
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  min-height: 36px;
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-lg);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
}

.progress-bar-fill.green {
  background: linear-gradient(90deg, var(--color-success) 0%, #2ED8A4 100%);
}

.progress-bar-fill.warning {
  background: linear-gradient(90deg, var(--color-warning) 0%, #FDE68A 100%);
}

.progress-bar-fill.error {
  background: linear-gradient(90deg, var(--color-error) 0%, #F09E8C 100%);
}

/* Badge / Chip */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.4;
}

.badge-accent {
  background: rgba(108, 92, 231, 0.12);
  color: var(--color-accent);
}

.badge-success {
  background: var(--color-success-light);
  color: #00896E;
}

.badge-warning {
  background: var(--color-warning-light);
  color: #B8860B;
}

.badge-error {
  background: var(--color-error-light);
  color: #C0533D;
}

.badge-easy {
  background: rgba(0, 184, 148, 0.12);
  color: var(--color-success);
}

.badge-medium {
  background: rgba(253, 203, 110, 0.2);
  color: #B8860B;
}

.badge-hard {
  background: rgba(225, 112, 85, 0.12);
  color: var(--color-error);
}

[data-theme="dark"] .badge-accent {
  background: rgba(108, 92, 231, 0.15);
  color: var(--color-accent-light);
}

[data-theme="dark"] .badge-success {
  background: rgba(0, 184, 148, 0.12);
  color: #4AEDC4;
}

[data-theme="dark"] .badge-warning {
  background: rgba(253, 203, 110, 0.12);
  color: var(--color-warning);
}

[data-theme="dark"] .badge-error {
  background: rgba(225, 112, 85, 0.12);
  color: #F09E8C;
}

/* Section Headers */
.section-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.section-subtitle {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

.section-header {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

.section-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* Stat Grid */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.stat-item {
  text-align: center;
  padding: var(--space-4);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color-light);
  box-shadow: var(--shadow-sm);
}

.stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

/* ========================================
   Domain / Topic Cards (Study Page)
   ======================================== */
.domain-grid {
  display: grid;
  gap: var(--space-3);
}

.domain-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-color-light);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.domain-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.domain-card:active {
  transform: translateY(0);
}

.domain-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.domain-card-icon.blue { background: rgba(45, 58, 140, 0.1); }
.domain-card-icon.purple { background: rgba(108, 92, 231, 0.1); }
.domain-card-icon.green { background: rgba(0, 184, 148, 0.1); }
.domain-card-icon.gold { background: rgba(253, 203, 110, 0.15); }
.domain-card-icon.red { background: rgba(225, 112, 85, 0.1); }

[data-theme="dark"] .domain-card-icon.blue { background: rgba(45, 58, 140, 0.2); }
[data-theme="dark"] .domain-card-icon.purple { background: rgba(108, 92, 231, 0.2); }
[data-theme="dark"] .domain-card-icon.green { background: rgba(0, 184, 148, 0.2); }
[data-theme="dark"] .domain-card-icon.gold { background: rgba(253, 203, 110, 0.2); }
[data-theme="dark"] .domain-card-icon.red { background: rgba(225, 112, 85, 0.2); }

.domain-card-text {
  flex: 1;
  min-width: 0;
}

.domain-card-text h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.domain-card-text p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: 2px;
}

.domain-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.domain-progress {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.domain-progress-text {
  font-size: var(--text-xs);
  color: var(--text-muted);
  white-space: nowrap;
}

.domain-progress .progress-bar {
  height: 6px;
  flex: 1;
}

/* Section tabs (RW / Math toggle on Study page) */
.section-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  background: var(--bg-input);
  border-radius: var(--radius-full);
  padding: 3px;
}

.section-tab {
  flex: 1;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.section-tab.active {
  background: var(--bg-card);
  color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .section-tab.active {
  background: var(--bg-card);
  color: var(--color-accent-light);
}

/* ========================================
   Flashcard
   ======================================== */
.flashcard-wrapper {
  perspective: 1200px;
  margin-bottom: var(--space-4);
  min-height: 240px;
}

.flashcard {
  position: relative;
  width: 100%;
  min-height: 240px;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  -webkit-tap-highlight-color: transparent;
}

.flashcard.flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  width: 100%;
  min-height: 240px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color-light);
}

.flashcard-front {
  position: relative;
  background: var(--bg-card);
  justify-content: center;
  align-items: center;
  text-align: center;
}

.flashcard-back {
  position: absolute;
  top: 0;
  left: 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--text-on-primary);
  transform: rotateY(180deg);
  justify-content: center;
}

[data-theme="dark"] .flashcard-back {
  background: linear-gradient(135deg, #2A2F50 0%, #3D2D6B 100%);
}

.flashcard-question-number {
  position: absolute;
  top: var(--space-3);
  left: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  opacity: 0.5;
}

.flashcard-tap-hint {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-4);
  font-size: var(--text-xs);
  opacity: 0.4;
}

.flashcard-question {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-primary);
}

.flashcard-domain {
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 500;
  opacity: 0.6;
  max-width: 50%;
  text-align: right;
}

.flashcard-answer-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
  margin-bottom: var(--space-2);
}

.flashcard-answer-item {
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.6;
  padding: var(--space-1) 0;
}

.flashcard-explanation {
  font-size: var(--text-sm);
  opacity: 0.85;
  line-height: 1.5;
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

/* Flashcard Navigation */
.flashcard-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: var(--text-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.nav-btn:active {
  transform: scale(0.93);
}

/* ========================================
   Quiz / Practice Mode
   ======================================== */

/* Quiz Setup */
.quiz-setup-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.quiz-setup-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.quiz-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 40px;
  font-family: var(--font-sans);
}

.quiz-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.quiz-chip.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--text-on-accent);
}

[data-theme="dark"] .quiz-chip.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

/* Quiz Progress */
.quiz-progress {
  margin-bottom: var(--space-3);
}

.quiz-progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-1);
}

.quiz-progress-text {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
}

.quiz-progress-score {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
}

/* Quiz Question */
.quiz-question-text {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-primary);
}

/* Quiz Options (A/B/C/D) */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-primary);
  -webkit-tap-highlight-color: transparent;
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--color-accent);
  background: var(--bg-input);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.quiz-option:active:not(.disabled) {
  transform: scale(0.98);
}

.quiz-option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-input);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.quiz-option-text {
  flex: 1;
  line-height: 1.4;
}

/* Selected state */
.quiz-option.selected {
  border-color: var(--color-accent);
  background: rgba(108, 92, 231, 0.08);
}

.quiz-option.selected .quiz-option-letter {
  background: var(--color-accent);
  color: white;
}

/* Correct state */
.quiz-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-light);
}

.quiz-option.correct .quiz-option-letter {
  background: var(--color-success);
  color: white;
}

[data-theme="dark"] .quiz-option.correct {
  border-color: var(--color-success);
  background: rgba(0, 184, 148, 0.15);
}

/* Incorrect state */
.quiz-option.incorrect {
  border-color: var(--color-error);
  background: var(--color-error-light);
}

.quiz-option.incorrect .quiz-option-letter {
  background: var(--color-error);
  color: white;
}

[data-theme="dark"] .quiz-option.incorrect {
  border-color: var(--color-error);
  background: rgba(225, 112, 85, 0.15);
}

.quiz-option.disabled {
  cursor: default;
  pointer-events: none;
}

/* Quiz Feedback */
.quiz-feedback {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  margin-top: var(--space-3);
  animation: fadeSlideIn var(--transition-normal) ease forwards;
}

.quiz-feedback-correct {
  background: var(--color-success-light);
  border: 1px solid var(--color-success);
}

[data-theme="dark"] .quiz-feedback-correct {
  background: rgba(0, 184, 148, 0.12);
  border-color: rgba(0, 184, 148, 0.4);
}

.quiz-feedback-wrong {
  background: var(--color-error-light);
  border: 1px solid var(--color-error);
}

[data-theme="dark"] .quiz-feedback-wrong {
  background: rgba(225, 112, 85, 0.12);
  border-color: rgba(225, 112, 85, 0.4);
}

.quiz-feedback-icon {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.quiz-feedback-correct .quiz-feedback-icon { color: #00896E; }
.quiz-feedback-wrong .quiz-feedback-icon { color: #C0533D; }

[data-theme="dark"] .quiz-feedback-correct .quiz-feedback-icon { color: var(--color-success); }
[data-theme="dark"] .quiz-feedback-wrong .quiz-feedback-icon { color: var(--color-error); }

.quiz-feedback-explanation {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Quiz Results */
.quiz-results-score {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
}

.quiz-results-pct {
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

.quiz-results-feedback {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-top: var(--space-2);
}

.quiz-results-feedback.excellent { color: var(--color-success); }
.quiz-results-feedback.great { color: var(--color-success); }
.quiz-results-feedback.good { color: var(--color-info); }
.quiz-results-feedback.keep-going { color: var(--color-warning); }
.quiz-results-feedback.needs-work { color: var(--color-error); }

.quiz-results-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Missed Questions */
.quiz-missed-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.quiz-missed-item {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border-left: 3px solid var(--color-error);
}

.quiz-missed-question {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.4;
}

.quiz-missed-your-answer {
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-bottom: var(--space-1);
}

.quiz-missed-correct-answer {
  font-size: var(--text-sm);
  color: var(--color-success);
}

/* ========================================
   Reading Passage Styles
   ======================================== */
.passage-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color-light);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  max-height: 400px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.passage-text {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.passage-text p {
  margin-bottom: var(--space-3);
  text-indent: 1.5em;
}

.passage-text p:first-child {
  text-indent: 0;
}

.passage-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border-color-light);
}

.passage-line-numbers {
  counter-reset: line;
}

.passage-line-numbers p::before {
  counter-increment: line 5;
  content: counter(line);
  display: inline-block;
  width: 2em;
  margin-left: -2.5em;
  margin-right: 0.5em;
  text-align: right;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-indent: 0;
}

/* ========================================
   Split-Screen Layout (Desktop)
   ======================================== */
@media (min-width: 900px) {
  .split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    align-items: start;
  }

  .split-layout .passage-container {
    position: sticky;
    top: calc(var(--header-height) + var(--space-4));
    max-height: calc(100vh - var(--header-height) - var(--space-8));
    margin-bottom: 0;
  }

  .split-layout .question-panel {
    min-height: 0;
  }
}

/* ========================================
   Timer Display
   ======================================== */
.timer-display {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 90;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color-light);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  height: var(--timer-height);
  max-width: var(--max-width);
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

.timer-display.hidden {
  display: none;
}

.timer-value {
  font-size: var(--text-xl);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  min-width: 70px;
  text-align: center;
}

.timer-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.timer-display.urgent {
  background: var(--color-error-light);
  border-bottom-color: var(--color-error);
}

.timer-display.urgent .timer-value {
  color: var(--color-error);
  animation: timerPulse 1s infinite;
}

[data-theme="dark"] .timer-display.urgent {
  background: rgba(225, 112, 85, 0.15);
  border-bottom-color: rgba(225, 112, 85, 0.5);
}

[data-theme="dark"] .timer-display.urgent .timer-value {
  color: #F09E8C;
}

@keyframes timerPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* Adjust main content when timer is visible */
.timer-active #main-content {
  padding-top: calc(var(--timer-height) + var(--space-4));
}

/* Module/Section indicator in timer bar */
.timer-section {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
}

.timer-divider {
  width: 1px;
  height: 20px;
  background: var(--border-color);
}

/* ========================================
   Test Mode
   ======================================== */
.test-info-box {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--bg-input);
  border-left: 4px solid var(--color-accent);
}

.test-info-icon {
  font-size: 28px;
  flex-shrink: 0;
}

.test-info-title {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.test-info-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.test-info-list li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: var(--space-4);
  position: relative;
}

.test-info-list li::before {
  content: '\2022';
  position: absolute;
  left: var(--space-2);
  color: var(--color-accent);
  font-weight: 700;
}

/* Question Dots */
.test-score-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  flex-wrap: wrap;
}

.test-dot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.test-dot.current {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: white;
  transform: scale(1.15);
}

.test-dot.correct {
  border-color: var(--color-success);
  background: var(--color-success);
  color: white;
}

.test-dot.wrong {
  border-color: var(--color-error);
  background: var(--color-error);
  color: white;
}

/* Test Results */
.test-result-hero {
  position: relative;
  overflow: hidden;
}

.test-result-badge {
  font-size: 56px;
  margin-bottom: var(--space-3);
}

.test-result-score {
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.test-result-score.high { color: var(--color-success); }
.test-result-score.mid { color: var(--color-warning); }
.test-result-score.low { color: var(--color-error); }

/* ========================================
   Stats Cards (Progress Page)
   ======================================== */
.stats-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-color-light);
}

.stats-card + .stats-card {
  margin-top: var(--space-3);
}

.stats-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.stats-card-icon {
  font-size: 20px;
}

.stats-card-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-primary);
}

/* Mastery Distribution */
.mastery-dist-bar {
  display: flex;
  height: 12px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--bg-input);
  width: 100%;
}

.mastery-dist-bar .segment-mastered { background: var(--color-success); transition: width var(--transition-slow); }
.mastery-dist-bar .segment-learning { background: var(--color-warning); transition: width var(--transition-slow); }
.mastery-dist-bar .segment-new { background: var(--bg-input); transition: width var(--transition-slow); }

.mastery-legend {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.mastery-legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: var(--space-1);
  vertical-align: middle;
}

.mastery-legend-dot.mastered { background: var(--color-success); }
.mastery-legend-dot.learning { background: var(--color-warning); }
.mastery-legend-dot.new { background: var(--border-color); }

/* Domain Performance Rows */
.domain-perf-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border-color-light);
}

.domain-perf-row:last-child {
  border-bottom: none;
}

.domain-perf-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  min-width: 90px;
  flex-shrink: 0;
}

.domain-perf-row .progress-bar {
  flex: 1;
  height: 6px;
}

.domain-perf-pct {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-muted);
  min-width: 36px;
  text-align: right;
}

/* Score Trend Chart */
.trend-chart-container {
  position: relative;
  height: 140px;
  padding-top: var(--space-4);
}

.trend-chart-bars {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 6px;
  height: 100%;
  position: relative;
  z-index: 2;
}

.trend-bar {
  width: 100%;
  border-radius: 4px 4px 0 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 8%;
  transition: height var(--transition-normal);
}

.trend-bar.high { background: var(--color-success); }
.trend-bar.mid { background: var(--color-warning); }
.trend-bar.low { background: var(--color-error); }

.trend-bar-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: white;
  padding-top: 4px;
}

/* Activity Feed */
.activity-feed {
  display: flex;
  flex-direction: column;
  position: relative;
  padding-left: var(--space-5);
}

.activity-feed::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--border-color);
  border-radius: 1px;
}

.activity-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  position: relative;
}

.activity-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-5) + 5px);
  top: calc(var(--space-2) + 6px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--bg-primary);
  z-index: 1;
}

.activity-text {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--text-primary);
  line-height: 1.4;
}

.activity-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Reset / Danger Button */
.reset-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  border: 2px solid var(--color-error);
  background: transparent;
  color: var(--color-error);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.reset-btn:hover {
  background: var(--color-error);
  color: white;
}

.reset-btn:active {
  transform: scale(0.95);
}

/* ========================================
   Tips Page
   ======================================== */
.tip-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-color-light);
  margin-bottom: var(--space-3);
}

.tip-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.tip-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
  background: rgba(108, 92, 231, 0.1);
}

.tip-card-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-primary);
}

.tip-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tip-list li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  padding: var(--space-2) 0;
  padding-left: var(--space-5);
  position: relative;
  border-bottom: 1px solid var(--border-color-light);
}

.tip-list li:last-child {
  border-bottom: none;
}

.tip-list li::before {
  content: '\2713';
  position: absolute;
  left: var(--space-1);
  color: var(--color-success);
  font-weight: 700;
  font-size: var(--text-sm);
}

/* Keyboard shortcut style for Desmos tips */
.kbd {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

/* ========================================
   Score Celebration
   ======================================== */
.confetti-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 8px;
  height: 14px;
  top: -20px;
  border-radius: 2px;
  animation: confettiFall linear forwards;
}

@keyframes confettiFall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* Score celebration glow */
.score-celebrate {
  animation: scoreGlow 1.5s ease-out;
}

@keyframes scoreGlow {
  0% {
    transform: scale(0.5);
    opacity: 0;
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ========================================
   Glassmorphism Card
   ======================================== */
.card-glass {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 16px rgba(45, 58, 140, 0.06);
}

[data-theme="dark"] .card-glass {
  background: rgba(28, 32, 64, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

/* ========================================
   Animations
   ======================================== */
.animate-in {
  animation: animateIn var(--transition-normal) ease forwards;
  opacity: 0;
}

@keyframes animateIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-scale {
  animation: animateScale var(--transition-normal) ease forwards;
  opacity: 0;
}

@keyframes animateScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.stagger-1 { animation-delay: 60ms; }
.stagger-2 { animation-delay: 120ms; }
.stagger-3 { animation-delay: 180ms; }
.stagger-4 { animation-delay: 240ms; }

/* Gradient text */
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 50%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   Confirm Dialog Overlay
   ======================================== */
.confirm-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
  animation: fadeSlideIn var(--transition-fast) ease forwards;
}

[data-theme="dark"] .confirm-overlay {
  background: rgba(0, 0, 0, 0.7);
}

.confirm-dialog {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

/* ========================================
   Action Cards
   ======================================== */
.action-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-color-light);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  color: inherit;
}

.action-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
  color: inherit;
}

.action-card + .action-card {
  margin-top: var(--space-3);
}

.action-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.action-card-text h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.action-card-text p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
  text-align: center;
  padding: var(--space-10) var(--space-4);
  color: var(--text-muted);
}

.empty-state .emoji {
  font-size: 48px;
  margin-bottom: var(--space-3);
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center { text-align: center; }
.text-sm { font-size: var(--text-sm); }
.text-muted { color: var(--text-secondary); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.w-full { width: 100%; }

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: white;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: var(--space-2);
}

/* ========================================
   Quiz History List
   ======================================== */
.quiz-history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz-history-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border-color-light);
}

.quiz-history-item:last-child {
  border-bottom: none;
}

.quiz-history-score {
  font-size: var(--text-base);
  font-weight: 700;
  min-width: 48px;
  text-align: center;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.quiz-history-score.high {
  background: var(--color-success-light);
  color: #00896E;
}

.quiz-history-score.low {
  background: var(--color-error-light);
  color: #C0533D;
}

.quiz-history-detail {
  display: flex;
  flex-direction: column;
}

.quiz-history-pct {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.quiz-history-meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ========================================
   Responsive
   ======================================== */
@media (min-width: 640px) {
  #main-content {
    padding-bottom: var(--space-6);
    max-width: 640px;
    margin: 0 auto;
  }

  .bottom-nav {
    position: static;
    height: auto;
    box-shadow: none;
    border-top: none;
    border-bottom: 1px solid var(--border-color);
    max-width: 640px;
    margin: 0 auto;
    padding: var(--space-1) 0;
    padding-bottom: 0;
  }

  .nav-item {
    flex-direction: row;
    gap: var(--space-2);
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
  }

  .nav-item .nav-icon {
    font-size: 18px;
  }

  .nav-item.active {
    background: var(--bg-input);
  }

  .nav-item.active::before {
    display: none;
  }
}

@media (min-width: 768px) {
  .app-container {
    max-width: 720px;
  }

  .stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========================================
   Dark Mode Refinements
   ======================================== */
[data-theme="dark"] .card:focus-within,
[data-theme="dark"] .card.active {
  box-shadow: 0 0 0 1px rgba(108, 92, 231, 0.3), var(--shadow-card);
}

[data-theme="dark"] .action-card:hover {
  box-shadow: 0 0 0 1px rgba(108, 92, 231, 0.2), var(--shadow-md);
}

[data-theme="dark"] .domain-card:hover {
  box-shadow: 0 0 0 1px rgba(108, 92, 231, 0.2), var(--shadow-md);
}